Impact of Atmospheric Conditions and Source Identification of Gaseous Polycyclic Aromatic Hydrocarbons (PAHs) during a Smoke Haze Period in Upper Southeast Asia

被引:0
|
作者
Tala, Wittaya [1 ,2 ,3 ]
Kraisitnitikul, Pavidarin [1 ,2 ]
Chantara, Somporn [1 ,3 ]
机构
[1] Chiang Mai Univ, Fac Sci, Environm Sci Res Ctr ESRC, Chiang Mai 50200, Thailand
[2] Chiang Mai Univ, Off Res Adm, Chiang Mai 50200, Thailand
[3] Chiang Mai Univ, Fac Sci, Dept Chem, Environm Chem Res Lab ECRL, Chiang Mai 50200, Thailand
关键词
air pollution; diagnostic ratios; gaseous PAHs; meteorological conditions; northern Thailand; HEALTH-RISK ASSESSMENT; PARTICLE-BOUND PAHS; GAS-PHASE REACTIONS; AMBIENT AIR; SOURCE APPORTIONMENT; PARTICULATE PAHS; METEOROLOGICAL PARAMETERS; SEASONAL-VARIATION; NITRO-PAHS; N-ALKANES;
D O I
10.3390/toxics11120990
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Gaseous polycyclic aromatic hydrocarbons were measured in northern Thailand. No previous studies have provided data on gaseous PAHs until now, so this study determined the gaseous PAHs during two sampling periods for comparison, and then they were used to assess the correlation with meteorological conditions, other pollutants, and their sources. The total concentrations of 8-PAHs (i.e., NAP, ACY, ACE, FLU, PHE, ANT, FLA, and PYR) were 125 +/- 22 ng m-3 and 111 +/- 21 ng m-3, with NAP being the most pronounced at 67 +/- 18 ng m-3 and 56 +/- 17 ng m-3, for morning and afternoon, respectively. High temperatures increase the concentrations of four-ring PAHs, whereas humidity and pressure increase the concentrations of two- and three-ring PAHs. Moreover, gaseous PAHs were estimated to contain more toxic derivatives such as nitro-PAH, which ranged from 0.02 ng m-3 (8-Nitrofluoranthene) to 10.46 ng m-3 (1-Nitronaphthalene). Therefore, they could be one of the causes of local people's health problems that have not been reported previously. Strong correlations of gaseous PAHs with ozone indicated that photochemical oxidation influenced four-ring PAHs. According to the Pearson correlation, diagnostic ratios, and principal component analysis, mixed sources including coal combustion, biomass burning, and vehicle emissions were the main sources of these pollutants.
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页数:22
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